components/proximity_auth/webui/resources/log-panel.js

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 Polymer({
   6   is: 'log-panel',
   7   properties: {
   8     /**
   9      * List of displayed logs.
  10      * @type {Array<{{
  11      *    text: string,
  12      *    date: string,
  13      *    source: string
  14      * }}>}
  15      */
  16     logs: Array,
  17   },
  18
  19   observers: [
  20     'logsChanged_(logs.*)',
  21   ],
  22
  23   /**
  24    * @type {boolean}
  25    * @private
  26    */
  27   isScrollAtBottom_: true,
  28
  29   /**
  30    * Called after the Polymer element is initialized.
  31    */
  32   ready: function() {
  33     this.$.list.onscroll = this.onScroll_.bind(this);
  34     this.async(this.scrollToBottom_);
  35   },
  36
  37   /**
  38    * Called when the list of logs change.
  39    */
  40   logsChanged_: function() {
  41     if (this.isScrollAtBottom_)
  42       this.async(this.scrollToBottom_);
  43   },
  44
  45   /**
  46    * Clears the logs.
  47    * @private
  48    */
  49   clearLogs_: function() {
  50     this.$.logBuffer.clearLogs();
  51   },
  52
  53   /**
  54    * Event handler when the list is scrolled.
  55    * @private
  56    */
  57   onScroll_: function() {
  58     var list = this.$.list;
  59     this.isScrollAtBottom_ =
  60         list.scrollTop + list.offsetHeight == list.scrollHeight;
  61   },
  62
  63   /**
  64    * Scrolls the logs container to the bottom.
  65    * @private
  66    */
  67   scrollToBottom_: function() {
  68     this.$.list.scrollTop = this.$.list.scrollHeight;
  69   },
  70
  71   /**
  72    * @param {LogMessage} log
  73    * @return {string} The filename stripped of its preceeding path concatenated
  74    *     with the line number of the log.
  75    * @private
  76    */
  77   computeFileAndLine_: function(log) {
  78     var directories = log.file.split('/');
  79     return directories[directories.length - 1] + ':' + log.line;
  80   },
  81 });